Quote:
Originally posted by mbtoloczko
Lee,
I have a suggestion to easily quantify the difference in the rolling circumference between the front and rear tires.
1) Find a piece of straight road that's at least 1/4 mile. 1/2 is better.
2) Write down the odometer reading for your car.
3) Mark the sidewall of all four tires at point on the sidewall that is closest to the ground.
4) Drive the car 0.1 miles. Get out, and note how much the front and rear wheels are out of sync. If your tires are as close in rolling circumference as you think, there will be virtually no difference after 0.1 miles. Drive another 0.1 miles and check.
I did this and found that after 1/2 mile, the front wheels had rotated only 1/2 more revolution than the rear wheels. This was with 37.5 psi in the front and 35 psi in the rear. With this information and a rough measurement of the rolling circumference (for my wheels its 6.4 feet), its possible to calculate the difference in the rolling circumference of the front and rear wheels. For the numbers above, the difference in rolling circumference between the front and rear wheels is 0.25% which equals 0.2 inches. Pretty darn small.
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Gosh, seems almost too easy
I might get to finish this in my lifetime
I've got straight, flat roads that go on for miles. I can think of one exceptional stretch inside the gate at Cape Canaveral. Now if I can just convince the security people that I'm really doing a scientific test for a group of car nuts.....
How did you do the rolling circumference rough measurement? I could easily do something like 10 turns of a chalk marked tire....